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The Rochester Conferences on Coherence and Quantum Optics and the Quantum Information and Measurement meeting

Applications of Squeezed States of Light - Quantum Teleportation and Related Quantum Information Processing

Akira Furusawa

Published Jan 1, 2007• 1 citation
Publisher

Abstract

We have succeeded in creating -9dB quadrature squeezing with a periodically poled KTiOPO4 crystal. By using the high level of squeezing, we have also succeeded in high-fidelity quantum teleportation and related quantum information processing.
DOI
10.1364/cqo.2007.cwa2

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Quadrature squeezed states of light are important resources for continuous-variable quantum inforamtion protocols. Squeezing level or purity of the states often dominate the performances of such protocols. In this article, I review our experiment which generates the quadrature squeezed state of light at 860nm with high squeezing level and purity. The generated state has been improved in its squeezing level and purity by using a periodically-poled KTiOPO4 (PPKTP) crystal as a nonlinear optical medium in a sub-threshold cw pumped optical parametric oscillator.
Quantum teleportation is one of the most fundamental subjects in quantum information technology. This is because quantum teleportation can be used as not only a communication network but also a building block for universal quantum information processing. It is well known that there are two approaches (i. e. discrete and continuous variable approaches) in quantum information processing. In particular, continuous variable one has some advantages, that is, capability for deterministic and efficient quantum operations. In the case of continuous variable quantum teleportation, however, we cannot teleport quantum states perfectly due to finite level of quadrature squeezed states. Hence it is important to improve the fidelity of teleportation to realize more advanced quantum network and circuits. Thanks to the recent improvement of squeezing level, fidelity up to F=0.83 has been achieved. In this article, we review the experiment of high fidelity quantum teleportation for continuous variables, and its applications.
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